"The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), a component of the United States Department of Justice, is a law enforcement agency charged with protecting our communities from violent criminals, criminal organizations, the illegal possession, use and trafficking of firearms, the illegal possession, use and storage of explosives, acts of arson and bombings, and the illegal diversion of alcohol and tobacco products. We are proud to partner with industries, law enforcement, and the community to protect the public we serve. [...] The 2014 edition of the Federal Firearms Regulations Reference Guide contains information that will help you comply with the Federal laws and regulations governing the manufacture, importation and distribution of firearms and ammunition. This edition contains new and amended statues [sic] enacted since publication of the 2005 edition, as well as updated regulations and ruling issued by ATF. In addition to these updated materials, in response to inquiries received from industry members, the public, and partner agencies, the 2014 edition contains additional and amended Questions and Answers to assist with compliance."
ATF Publication 5300.4; Bureau of Alcohol, Tobacco, Firearms and Explosives Publication 5300.4
Bureau of Alcohol, Tobacco, and Firearms [ATF]: http://www.atf.gov/